Group 8 Dispersive Soils

May 5th, 2015
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Dispersive soils are associated with residual granites, granodiorites, mudstone and sandstone as well as fine-grained transported soils such as alluvium deposits. Dispersitivity is found in clay, silty and sandy soil. Dispersible soils tend to be highly erodible and present problems for successfully managing earth works.

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Group 8 Dispersive SoilsTshwane University of TechnologyDepartment of Environmental SciencesEngineering GeologyGroup 8 Assignment:Dispersive SoilsGroup Members:1. Elsie Phelane2. Keeme Sephikwe3. Lawrance Mabasa4. Lethlogonolo kotsediDISPERSIVE SOILSINTRODUCTIONDispersive soils are associated with residual granites, granodiorites, mudstone and sandstone as well as fine-grained transported soils such as alluvium deposits. Dispersitivity is found in clay, silty and sandy soil. Dispersible soils tend to be highly erodible and present problems for successfully managing earth works. It is an indicator of sodic soils as it occurs when excessive sodium is present, when water is added the sodium attach to the clay and forces the clay particles apart. This results in a cloud of clay forming around the aggregate. The fine clay particles that have dispersed clog up the small pores in the soil and degrade the soil structures as well as restricting root growth and water movement. DEFINITIONDispersible soils are soils that are structurally unstable and disperse in water into basic particles (sand, silt and clay). DESCRIPTION OF DESPERSIVE CLAY SOILSInitially, clay soils were thought to be highly resistant to erosion from the flow water, lately it has been found that highly erodible clay soils exist in nature. Some natural clay soils disperse in the presence of relatively pure water and are highly susceptible to erosion. The tendency for dispersive erosion in a give

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